Clam ping-frame



(No Model.) T. STEINERT- GLAMPING FRAME I 8 Patented July 23, 1889. No. 407,69 4

UNITED STATES PATENT OFFICE.

THEODOR STEINERT, OF CHICAGO, ILLINOIS.

CLAM Pl NG -FRAM E.

SPECIFICATION forming part Of Letters Patent No. 407,698, dated July 23, 1889.

Application fi February 19, 1889. Serial No. 300,501. (No model.)

To aZZ whom it may concern:

Be it known that I, THEoDoE STEINERT, a

, citizen of the United States of America, re-

siding at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Clamping- Frames, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to the manufacture of upright pianos, and, more particularly, of the back-frames thereof, being composed of a series of timbers separated by blocks and rigidly connected therewith to make the whole a strong and durable framework for supporting the cast-iron string-frame. These timbers and separating blocks heretofore were glued together one by one, whereby the process of manufacture was a very slow one ;v

and it has been the object of this my invention to provide a device that will enable me to glue the entire frame in one operation and to insure its being square and true; and with that object in view my invention consists of the novel devices and combinations of devices hereinafter described and specifically claimed.

In the accompanying drawings, Figure 1 represents a perspective view of the pianoback frame as placed and secured in the gluing-frame; Fig. 2, a perspective view of the piano-back frame as completed and removed; Fig. 3, a section on line 3 3 in Fig. 2, and Fig. 4 a perspective view of the gluingframe.

Oorresponding letters of reference in the several figures of the drawings designate like parts.

The piano-back frame consists of the square timbers A, planed to have two parallel sides and two sides tapering. These timbers A are secured parallel with each other by gluing separating-blocks a and 1) between the same at the opposite ends thereof and by securing under their upper ends a plate of Wood 0 and under their lower ends a plate of wood (I, also by gluing.

The gluing-frame consists of two flat timbers E and F, secured a proper distance apart at one end by a bar of wood G, rigidly secured upon these timbers E and F, and at their opposite ends by a stringer II, framed between, the tenons of which enter mortises in the timbers E and F. The bar G being secured upon timber F by wood-screws, the

distance between the bars E and F may be varied to suit different-sized piano-frames, for which purpose different-length stringers H are to be provided. An upwardly-projecting plate f is secured against the lower edge of timber F, which, together with bar G, will provide shoulders of an angle of ninety degrees as a gage for holding the piano-back frame to be square while being glued, and upon the lower edge of timber E is secured a strip c as a gage for holding the plate 0 of the piano-back frame in proper ositions. Upon the end opposite to bar G is secured upon timber E a block I, through which a clamp-screw t' is tapped, and upon each of the bars G and block I is fixed a post j and j for a bar J, having square holes at or near its ends that will fit upon posts j and j to tie the same and thereby prevent their spreading or a bending of timber E while clamping the piano-back frame between bar G and block I by screw '5. The lower end of the piano-back frame is contracted by a removable joiners clamp K, provided with clamp-screw Z.

Formakin g the piano-back frame, the parts A, a, b, c, and d, all being planed to proper sizes, are warmed on or in a stove or oven, and are then coated at their joining-faces with glue and are then placed in the gluingframe in proper relative posit-ions, and after the clamp-screws t' and Z are tightened a series of common joiners clamps will be attached in the usual manner over timber E and bar J and over timber F and blocks 2) for compressing and holding the plates 0 and cl in close contact with the blocks a and b and with the ends of timbers A until the glue has hardened, when the piano-back frame is completed and maybe removed from the gluingframe for another one to be placed therein.

What I claim is The frame for the purpose described, consisting of timbers E and F, connected by bar G and stringer H, and having block I, with clamp-screw t, and posts jj, engaging bar J, said timber F having projecting plate f, and timber E having strip 6, all substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses. I

THEOD OR STEINERT.

IVitn esses:

WILLIAM H. LOTZ, OTTO LUBKEET. 

